Define orbital velocity. How is it related with escape velocity?

Define an orbital.

What is meant by Angular velocity ? How is it related to linear velocity ? Derive the relation

Define relative velocity?

Define velocity.

Define relaxation time of the electrons drifting in a conductor. How is it related to the drift velocity of free electrons? Use this relation to deduce the expression for electrical resistivity of the material.

Define orbital velocity of a satellite. Obtain an expression for orbital velocity of a satellite.